What we do, what we learn is just a start to what will it end up with. And to be honest, That's good enough.
To start on learning this thing.. just work on the "photoshop" skills, as a start.
Start off by taking pictures off the internet, or simply dragging personal pictures in to it.. All we have to do is have fun with those pictures, create, add, subtract, edit, paste, creativity, colors, fonts, shapes, sizes, ETC.
Is all we need to know about this thing, as long as we got this in our head. Well then congratulations, we took our first step towards Multimedia.
An easy way to remember it is....
Learn how to use the tools right. and anyone will be able to create a fine piece "ART"